Motor Control Device

Abstract

If the control of a motor becomes impossible, the motor appropriately stops, and drive wheels are driven by an engine to enable retraction travel. A motor/generator 4 is used to drive drive wheels of a vehicle, and start an engine 3 . A motor controller 22 implements a first control mode for controlling the motor/generator 4 on the basis of a command from an integrated controller 20 if a CAN communication with the integrated controller 20 is normal. The motor controller 22 implements a second control mode for controlling the motor/generator 4 on the basis of control information stored in advance to allow the motor/generator 4 to start the engine 3 when the engine 3 is in stop if the CAN communication with the integrated controller 20 is abnormal.

1 . A motor control device that is mounted on a vehicle which is a hybrid electric vehicle having an engine and a motor, for controlling the motor, wherein
 the motor is used to drive drive wheels of the vehicle, and start the engine,   the vehicle includes:
 the motor control device; 
 an engine control device that controls the engine; and 
 an integrated control device that is communicatively connected to the motor control device and the engine control device, and outputs a command corresponding to a driving state of the vehicle to the motor control device and the engine control device, 
   the motor control device implements a first control mode for controlling the motor on the basis of the command from the integrated control device if a communication with the integrated control device is normal, and   implements a second control mode for controlling the motor on the basis of control information stored in advance to allow the motor to start the engine when the engine is in stop if the communication with the integrated control device is abnormal.   
     
     
         2 . The motor control device according to  claim 1 , wherein
 if the engine is in stop, the motor is controlled to rotate in a given rotating state in the second control mode, and   if the engine is in operation, the motor is controlled to stop in the second control mode.   
     
     
         3 . The motor control device according to  claim 2 , wherein
 if the engine is in stop, in the second control mode, after the motor is controlled to rotate in the given rotating state, the motor is controlled to stop.   
     
     
         4 . The motor control device according to  claim 2 , wherein
 a rotation speed control for rotating the motor according to a given target rotation speed is performed so that the motor is controlled to rotate in the given rotating state.   
     
     
         5 . The motor control device according to  claim 4 , wherein
 it is determined whether the engine has started, or not, and   if it is determined that the engine has started, the rotation speed control is completed.   
     
     
         6 . The motor control device according to  claim 5 , wherein
 a torque of the motor is detected, and   it is determined whether the engine has started, or not, on the basis of the detected torque of the motor.   
     
     
         7 . The motor control device according to  claim 4 , wherein
 when the rotation speed control is performed, the rotation speed of the motor changes to the target rotation speed at a given change rate.   
     
     
         8 . The motor control device according to  claim 7 , wherein
 the change rate changes according to an elapsed time since the rotation speed control starts.   
     
     
         9 . The motor control device according to  claim 7 , wherein
 a torque of the motor is detected, and   the change rate is determined on the basis of the detected torque of the motor.   
     
     
         10 . The motor control device according to  claim 1 , wherein
 the vehicle further includes:
 a first engaging/disengaging unit that engages or disengages between the engine and the motor; 
 a first engaging/disengaging control device that controls the first engaging/disengaging unit; 
 a second engaging/disengaging unit that engages or disengages between the motor and the drive wheels; and 
 a second engaging/disengaging control device that controls the second engaging/disengaging unit, 
   wherein when the second control mode is implemented by the motor control device, the engine and the motor are engaged with each other by the first engaging/disengaging unit, and the engine starts by the motor in a state where the motor and the drive wheels are disengaged from each other by the second engaging/disengaging unit.   
     
     
         11 . The motor control device according to  claim 10 , wherein
 if the engine is in stop, after the motor is controlled to rotate in a given rotating state in the second control mode, the motor is controlled to stop according to a signal from at least one of the engine control device and the first engaging/disengaging control device.   
     
     
         12 . A motor control device that is mounted on a vehicle which is a hybrid electric vehicle having an engine and a motor, and controls the motor, wherein
 if a communication with an external control device is abnormal, a first control mode for controlling the motor on the basis of a command from the external control device is switched to a second control mode for controlling the motor on the basis of control information stored in advance.